You need to play with it more! I've got my Graphtec to cut just as clean as our $80,000 multicam does.
https://photos.app.goo.gl/kRFiAFKjZGrJTwyb9 You'll see some fuzzy edges... thats usually when I know the blades really dull, or before I learned how to dial it in properly.. but these days 99% of my cuts are perfectly smooth.
There are still times when I get fuzzy edges...when I use a material or overlam I dont normally use so my blade isnt dialed in 100%... Or if I'm lazy and havent swapped out blades. The good part about cheap blades and swapping them before they have a chance to get dull is you never need to re-adjust the blade. I swap it everyday, or every 50-100 ft of cutting small stickers. You can buy 2000 blades for $500 usd... Theyre perfect for perf cutting, I wouldnt use them for kiss cutting..or at least I havent because Ive heard some blades have bad tips, and it can cause crappy intricate cuts. I just pop in a cleancut blade for my kiss cuts, and it lasts me months...so not worth it using a cheap one for kiss cuts. I've gotten so used to my graphtec I print a roll of signage and have my graphtec pounce out the sign at the crops so I dont have to manually unwind / hand cut them into seperate sheets... lazyness ftw, haha. The only thing I hand cut with a straight edge anymore is banner, and reflective vinyls. I know graphtecs a bit slow compared to a Summa flatbed for finishing... so I cant wait until I get a summa flatbed... but for now, the graphtec works!
I have 3 blade holders dedicated to perf cutting... 1 for Calandered, 1 for cast, and one for unlaminated. at $10 a holder on Amazon (Again... wouldnt use these for kiss cutting, too much play) dialing in your settings and not having to mess around is worth having a few holders on hand.
I've used $1000 3M rolls and $100 generic rolls. all will cut cleanly.. You just need to adjust your blade for different thickness's. The cheap stuff will curl a bit... As mentioned above, anything with a #90LB stayflat liner is the best for cutting... The last thing you want to do is send a bunch of curled up stickers to your client.